Some RB20 and 25 questions

[side waz]

Hey all what's up.

I am either going to be doing a 20 or 25 swap in my 91 240 hatch. It will all depend on how much my sponsor wants to pay out for the swap.

Now I'v been reading through some of the posts regarding wiring and mounts and have a few questions that I really did'nt get answered definitivley.

1) Is it easier to purchase a used KA24DE harness and send it out along with the RB harness to get done? and exactly what part(s) of the KA do I send? I know that will mean taking out my original harness when the new arrives or does it?

2) Should I wire the RB harness myself with the harness from MY car as opposed to buying a used one? I don't think I trust myself to do the wiring but I think I can get some people to help me out.

3) The mount kits (lets just McKinney's as an example) are supposed to fit the RB like it was made for the 240. Is that true? Does everything fit and clear? I know about knotching the stock down pipe but I plan on using McKinney's 3" anyway.

4) Use the cross members or mount kits?

5) The RB20 driveshaft "supposedly" slides right from the RB transmission in to the 240 rear end. Is that true?

Well that's about it. Any other advise would be greatly appreciated too!

Thanks in advance and take care.

Easy

[Yellow4g63]

I went with a mount kit, Stock KA drive shaft fits into RB20 transmission and bolts up to the diff. I wired it myself too thanks to CarlH and others from this board.

[BoostFab]

the rb20 drive-shaft bolt in as well and allow room for play, which i'm using right now. i'm also using the r32 x-member, it's directly bolt on, the engine just sit higher than custom mounts. for some reason my r32 x-member set the shifter in the exact spot as i've compared to when the motor was in the clip .

[NISMO_RB25]

Hey all what's up.

I am either going to be doing a 20 or 25 swap in my 91 240 hatch. It will all depend on how much my sponsor wants to pay out for the swap.

Now I'v been reading through some of the posts regarding wiring and mounts and have a few questions that I really did'nt get answered definitivley.

1) Is it easier to purchase a used KA24DE harness and send it out along with the RB harness to get done? and exactly what part(s) of the KA do I send? I know that will mean taking out my original harness when the new arrives or does it?

2) Should I wire the RB harness myself with the harness from MY car as opposed to buying a used one? I don't think I trust myself to do the wiring but I think I can get some people to help me out.

3) The mount kits (lets just McKinney's as an example) are supposed to fit the RB like it was made for the 240. Is that true? Does everything fit and clear? I know about knotching the stock down pipe but I plan on using McKinney's 3" anyway.

4) Use the cross members or mount kits?

5) The RB20 driveshaft "supposedly" slides right from the RB transmission in to the 240 rear end. Is that true?

Well that's about it. Any other advise would be greatly appreciated too!

Thanks in advance and take care.

Easy

1) you send the upper harness from both cars(that is the one that plugs into your ECU)The lower harness goes to your transmission, and you will use the one from your KA on your RB)

2)I didn't really trust myself at the time, and I wanted to make sure that if the car didn't start, it wasn't because I screwed up the wiring and fried my ECU. Many people do it themselves, so it is definitely possible. For me it was worth the $350. See Mckinney Motorsports <<<<Sponsor

3) look under Member's Ride section under NISMO_RB25, That is pics of my car with mckinney mounts and driveshaft. Small dent in the firewall that no one can see, and everything lines up fine.

4) This has been beat to death, but I don't have any clearance problems with mounts so it was worth it to me.

5) Just remember that the RB25 will require a custom driveshaft, which mkcinney also sales.

Advice:It can be done "cheap" but if you are willing to dish out a little extra you will probably have less problems in the long run. I am at about 12K this far, and that was car,motorset, koyo, Tein Flex coilovers, and as of today complete tanabe control arms :ylsuper that just need to be installed.

[skillzilla]

Hey all what's up.

I am either going to be doing a 20 or 25 swap in my 91 240 hatch. It will all depend on how much my sponsor wants to pay out for the swap.

Now I'v been reading through some of the posts regarding wiring and mounts and have a few questions that I really did'nt get answered definitivley.

1) Is it easier to purchase a used KA24DE harness and send it out along with the RB harness to get done? and exactly what part(s) of the KA do I send? I know that will mean taking out my original harness when the new arrives or does it?

2) Should I wire the RB harness myself with the harness from MY car as opposed to buying a used one? I don't think I trust myself to do the wiring but I think I can get some people to help me out.

3) The mount kits (lets just McKinney's as an example) are supposed to fit the RB like it was made for the 240. Is that true? Does everything fit and clear? I know about knotching the stock down pipe but I plan on using McKinney's 3" anyway.

4) Use the cross members or mount kits?

5) The RB20 driveshaft "supposedly" slides right from the RB transmission in to the 240 rear end. Is that true?

Well that's about it. Any other advise would be greatly appreciated too!

Thanks in advance and take care.

Easy

1) and 2)

the wiring isnt that hard, definately not worth $350.

3)

I am using the tophat mounts, and although they made the installation a breeze, my intake mani still hits the hood, and the dump rubs too. I think this is just a given, some peeps get lucky and some dont. I dont have experience with the McKinney mounts.

4)

See above. Id use the cross member from the RB if you have it, and save money. I was forced to use the mounts cuz I got a motor set.

5)

The drive shaft from the 240 fits the RB20 transmission perfect. All you need to do is take an oil filter puller and twist the dust cover off the end of the transmission, right where the yoke goes in.

[Carl H]

it also depends on how bent the car is for everything to line up.some cars the dump pipe rubs others it doesnt.the tophat mounts are good and the quality is good, but they were designed for a rb20 in a s13 and nothing else, they may work they may not work in other cars.as for the driveshaft, just get a hammer and knock the dust cover off the transmission, no need for a special tool.besides 2 blows and its off.

[side waz]

Hey guys.

Thank you so very much for all this info.

I really don't think I want to touch the wiring. Im all thumbs when it comes to that

The only thing left really to know is, should I buy a used KA harness and send the upper KA and RB in? or would it be easier to take my original hareness out and send that in?

You guys have no idea how much i appreciate all the help.

Easy

[skillzilla]

I wouldnt really call an oil filter puller a speacialty tool, about as special as a BFH, which would work just as well like you said

[NISMO_RB25]

Hey guys.

Thank you so very much for all this info.

I really don't think I want to touch the wiring. Im all thumbs when it comes to that

The only thing left really to know is, should I buy a used KA harness and send the upper KA and RB in? or would it be easier to take my original hareness out and send that in?

You guys have no idea how much i appreciate all the help.

Easy

You should be able to remove your KA harness easily, so I don't really see the need for to buy another harness, unless you will be driving the car right up till you do the swap. The entire upper harness can be removed in probably 10 minutes max.